Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater

Nweke Chinenyenwa Nkeiruka; Nwabanne Joseph Tagbo

doi:doi:10.11648/j.ajep.20140305.11

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Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater

Nweke Chinenyenwa Nkeiruka, Nwabanne Joseph Tagbo

Published in American Journal of Environmental Protection (Volume 3, Issue 5)

Received: 11 September 2014 Accepted: 23 September 2014 Published: 20 October 2014

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Abstract

Simulation of a mathematical model for the design of steady-state continuous reactors required for the anaerobic digestion of wastewaters was carried out. This was obtained so as to make the design of continuous stirred tank reactor (CSTR) that would be used for the anaerobic digestion of vegetable oil wastewater (VOW) possible. The model considered the kinetics of the process which has been previously determined during the batch digestion of the wastewater. The hydraulic retention time (HRT) and solid retention time (SRT) which are important parameters required for the design were estimated by varying different model parameters such as efficiency of reactor, influent substrate concentration (So) and biomass concentration (X) at various food-microorganism ratios (F/M). The HRT was calculated for different reactor efficiency (E) varying in the range of 70-95% at a constant influent substrate concentration. It was observed that the HRT increased with increase in efficiency ranging between 1.10 to 7.06 days. HRT also increased as the biomass concentration increased. SRT at constant influent substrate concentration and biomass concentration were observed to increase as the reactor efficiency increased. The effect of different substrate concentration on HRT to attain a targeted efficiency in the CSTR under steady state condition was also studied. It was observed that HRT linearly increased with increase in influent substrate concentration at constant reactor efficiency and biomass concentration. HRT also increased with decrease in biomass concentration and constant reactor efficiency for a particular substrate concentration. There was also an increase in HRT as reactor efficiency increased at constant biomass and influent substrate concentrations. SRT calculated at E1 (70%) and E2 (80%) efficiencies were observed to decrease with increase in influent substrate concentration. As the efficiencies of the reactor increased, SRT was also observed to increase. With the information obtained from the model simulation, a continuous stirred tank reactor that would treat VOW by anaerobic digestion could be designed.

Published in	American Journal of Environmental Protection (Volume 3, Issue 5)
DOI	10.11648/j.ajep.20140305.11
Page(s)	209-216
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2014. Published by Science Publishing Group

Keywords

Anaerobic Digestion, Continuous Stirred Tank Reactor (CSTR), Process Design Model, Model Simulation, Vegetable Oil Wastewater (VOW)

References

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[6]	Siddique, M.N.I. and Zularisam, A.W. (2012) Continuous Stirred Tank Reactor Application for Renewable Methane from Anaerobic Biodegradation of Petrochemical Wastewater. Engineering e-Transaction, 7(1):23-27.
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[14]	Greenwood, S., Anderson, C., Rieth, M. and Stein, T. (2002) A Constant SRT Calculated from Liquid Flows Improves BNR Activated Sludge Performance. Central States Waster Environment Association, Illinois. www.cswea.org/papers/2002Radebaugh.pfd
[15]	Aline, F.V., Geraldo, F. S Jr. (2008) Is Hydraulic Retention Time an Essential Parameter for MBR Performance? Elsevier Journal of Hazardous Materials, 150(1):185-186.
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[19]	Nweke, C.N., Nwabanne, J.T. and Igbokwe, P.K. (2014) Kinetics of Batch Anaerobic Digestion of Vegetable Oil Wastewater. In press.
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APA Style

Nweke Chinenyenwa Nkeiruka, Nwabanne Joseph Tagbo. (2014). Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater. American Journal of Environmental Protection, 3(5), 209-216. https://doi.org/10.11648/j.ajep.20140305.11

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ACS Style

Nweke Chinenyenwa Nkeiruka; Nwabanne Joseph Tagbo. Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater. Am. J. Environ. Prot. 2014, 3(5), 209-216. doi: 10.11648/j.ajep.20140305.11

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AMA Style

Nweke Chinenyenwa Nkeiruka, Nwabanne Joseph Tagbo. Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater. Am J Environ Prot. 2014;3(5):209-216. doi: 10.11648/j.ajep.20140305.11

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@article{10.11648/j.ajep.20140305.11,
  author = {Nweke Chinenyenwa Nkeiruka and Nwabanne Joseph Tagbo},
  title = {Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater},
  journal = {American Journal of Environmental Protection},
  volume = {3},
  number = {5},
  pages = {209-216},
  doi = {10.11648/j.ajep.20140305.11},
  url = {https://doi.org/10.11648/j.ajep.20140305.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajep.20140305.11},
  abstract = {Simulation of a mathematical model for the design of steady-state continuous reactors required for the anaerobic digestion of wastewaters was carried out. This was obtained so as to make the design of continuous stirred tank reactor (CSTR) that would be used for the anaerobic digestion of vegetable oil wastewater (VOW) possible. The model considered the kinetics of the process which has been previously determined during the batch digestion of the wastewater. The hydraulic retention time (HRT) and solid retention time (SRT) which are important parameters required for the design were estimated by varying different model parameters such as efficiency of reactor, influent substrate concentration (So) and biomass concentration (X) at various food-microorganism ratios (F/M). The HRT was calculated for different reactor efficiency (E) varying in the range of 70-95% at a constant influent substrate concentration. It was observed that the HRT increased with increase in efficiency ranging between 1.10 to 7.06 days. HRT also increased as the biomass concentration increased. SRT at constant influent substrate concentration and biomass concentration were observed to increase as the reactor efficiency increased. The effect of different substrate concentration on HRT to attain a targeted efficiency in the CSTR under steady state condition was also studied. It was observed that HRT linearly increased with increase in influent substrate concentration at constant reactor efficiency and biomass concentration. HRT also increased with decrease in biomass concentration and constant reactor efficiency for a particular substrate concentration. There was also an increase in HRT as reactor efficiency increased at constant biomass and influent substrate concentrations. SRT calculated at E1 (70%) and E2 (80%) efficiencies were observed to decrease with increase in influent substrate concentration. As the efficiencies of the reactor increased, SRT was also observed to increase. With the information obtained from the model simulation, a continuous stirred tank reactor that would treat VOW by anaerobic digestion could be designed.},
 year = {2014}
}

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TY - JOUR
T1 - Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater
AU - Nweke Chinenyenwa Nkeiruka
AU - Nwabanne Joseph Tagbo
Y1 - 2014/10/20
PY - 2014
N1 - https://doi.org/10.11648/j.ajep.20140305.11
DO - 10.11648/j.ajep.20140305.11
T2 - American Journal of Environmental Protection
JF - American Journal of Environmental Protection
JO - American Journal of Environmental Protection
SP - 209
EP - 216
PB - Science Publishing Group
SN - 2328-5699
UR - https://doi.org/10.11648/j.ajep.20140305.11
AB - Simulation of a mathematical model for the design of steady-state continuous reactors required for the anaerobic digestion of wastewaters was carried out. This was obtained so as to make the design of continuous stirred tank reactor (CSTR) that would be used for the anaerobic digestion of vegetable oil wastewater (VOW) possible. The model considered the kinetics of the process which has been previously determined during the batch digestion of the wastewater. The hydraulic retention time (HRT) and solid retention time (SRT) which are important parameters required for the design were estimated by varying different model parameters such as efficiency of reactor, influent substrate concentration (So) and biomass concentration (X) at various food-microorganism ratios (F/M). The HRT was calculated for different reactor efficiency (E) varying in the range of 70-95% at a constant influent substrate concentration. It was observed that the HRT increased with increase in efficiency ranging between 1.10 to 7.06 days. HRT also increased as the biomass concentration increased. SRT at constant influent substrate concentration and biomass concentration were observed to increase as the reactor efficiency increased. The effect of different substrate concentration on HRT to attain a targeted efficiency in the CSTR under steady state condition was also studied. It was observed that HRT linearly increased with increase in influent substrate concentration at constant reactor efficiency and biomass concentration. HRT also increased with decrease in biomass concentration and constant reactor efficiency for a particular substrate concentration. There was also an increase in HRT as reactor efficiency increased at constant biomass and influent substrate concentrations. SRT calculated at E1 (70%) and E2 (80%) efficiencies were observed to decrease with increase in influent substrate concentration. As the efficiencies of the reactor increased, SRT was also observed to increase. With the information obtained from the model simulation, a continuous stirred tank reactor that would treat VOW by anaerobic digestion could be designed.
VL - 3
IS - 5
ER -

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Author Information

Nweke Chinenyenwa Nkeiruka

Department of Chemical Engineering, Nnamdi Azikiwe University, PMB 5025, Awka, Nigeria
Nwabanne Joseph Tagbo

Department of Chemical Engineering, Nnamdi Azikiwe University, PMB 5025, Awka, Nigeria

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APA Style

Nweke Chinenyenwa Nkeiruka, Nwabanne Joseph Tagbo. (2014). Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater. American Journal of Environmental Protection, 3(5), 209-216. https://doi.org/10.11648/j.ajep.20140305.11

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ACS Style

Nweke Chinenyenwa Nkeiruka; Nwabanne Joseph Tagbo. Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater. Am. J. Environ. Prot. 2014, 3(5), 209-216. doi: 10.11648/j.ajep.20140305.11

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AMA Style

Nweke Chinenyenwa Nkeiruka, Nwabanne Joseph Tagbo. Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater. Am J Environ Prot. 2014;3(5):209-216. doi: 10.11648/j.ajep.20140305.11

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@article{10.11648/j.ajep.20140305.11,
  author = {Nweke Chinenyenwa Nkeiruka and Nwabanne Joseph Tagbo},
  title = {Continuous Process Design Model Simulation for the Anaerobic Digestion of Vegetable Oil Wastewater},
  journal = {American Journal of Environmental Protection},
  volume = {3},
  number = {5},
  pages = {209-216},
  doi = {10.11648/j.ajep.20140305.11},
  url = {https://doi.org/10.11648/j.ajep.20140305.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajep.20140305.11},
  abstract = {Simulation of a mathematical model for the design of steady-state continuous reactors required for the anaerobic digestion of wastewaters was carried out. This was obtained so as to make the design of continuous stirred tank reactor (CSTR) that would be used for the anaerobic digestion of vegetable oil wastewater (VOW) possible. The model considered the kinetics of the process which has been previously determined during the batch digestion of the wastewater. The hydraulic retention time (HRT) and solid retention time (SRT) which are important parameters required for the design were estimated by varying different model parameters such as efficiency of reactor, influent substrate concentration (So) and biomass concentration (X) at various food-microorganism ratios (F/M). The HRT was calculated for different reactor efficiency (E) varying in the range of 70-95% at a constant influent substrate concentration. It was observed that the HRT increased with increase in efficiency ranging between 1.10 to 7.06 days. HRT also increased as the biomass concentration increased. SRT at constant influent substrate concentration and biomass concentration were observed to increase as the reactor efficiency increased. The effect of different substrate concentration on HRT to attain a targeted efficiency in the CSTR under steady state condition was also studied. It was observed that HRT linearly increased with increase in influent substrate concentration at constant reactor efficiency and biomass concentration. HRT also increased with decrease in biomass concentration and constant reactor efficiency for a particular substrate concentration. There was also an increase in HRT as reactor efficiency increased at constant biomass and influent substrate concentrations. SRT calculated at E1 (70%) and E2 (80%) efficiencies were observed to decrease with increase in influent substrate concentration. As the efficiencies of the reactor increased, SRT was also observed to increase. With the information obtained from the model simulation, a continuous stirred tank reactor that would treat VOW by anaerobic digestion could be designed.},
 year = {2014}
}

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